Buy RS3 Summerdown wool
Summerdown wool is a textile fibre in RuneScape 3. It comes from the red sheep of the family. Players gather it as produce from a summerdown ewe or ram raised in the medium pen at the player-owned farm. Golden ewes and golden rams can also drop it.
This wool has many uses. With level 54 Herblore, mix it with a wergali potion (unfinished) to make a runecrafting potion. This gives 122.5 Herblore experience. With level 91 Runecrafting, use it to create elite tectonic repair patches. These patches repair elite tectonic armour.
Summerdown wool also works at a spinning wheel. Combine it with fallfaced wool, springsheared wool, and winterwold wool to spin masterwork thread. This gives 110 experience for 10 thread. It can be used in ensouling material rituals at a Tier 2 ritual site at level 60, which grants 1,480 experience.
The item is tradeable and noteable, so it is easy to buy, sell, and store. It weighs only 0.02 kg. It can also be disassembled, mostly giving simple parts with a small chance of variable components.